Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 445:
Description
1992, Canada in Space, 42c x2 multicolored, top left corner sheet margin plate No. block of four containing two horizontal se-tenant pairs, left stamps have silver color omitted, marginal imprint and control markings, full OG, NH, VF and reportedly unique positional piece, since only one pane of 20 with omitted silver (10 stamps) was discovered, V. Greene certificate for the pane, C.v. $5,500, Unitrade C.v. CAD$7,500 for two pairs, Est. $4,000-$5,000, Scott #1441a
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